﻿// TortoiseGit - a Windows shell extension for easy version control

// Copyright (C) 2015-2020, 2023, 2025 - TortoiseGit
// Copyright (C) 2003-2015, 2017, 2023 - TortoiseSVN

// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software Foundation,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

#include "stdafx.h"
#include <olectl.h>
#include <Shlwapi.h>
#include <algorithm>
#include "Picture.h"
#include <Wincodec.h>
#include <d2d1.h>
#include <d2d1_3.h>

#pragma comment(lib, "d2d1.lib")
#pragma comment(lib, "shlwapi.lib")
#pragma comment(lib, "gdiplus.lib")
// note: linking with Windowscodecs.lib does not make the exe require the dll
// which means it still runs on XP even if the WIC isn't installed - WIC won't work
// but the exe still runs
#pragma comment(lib, "Windowscodecs.lib")

#define HIMETRIC_INCH 2540

CPicture::CPicture()
{
}

CPicture::~CPicture()
{
	FreePictureData(); // Important - Avoid Leaks...
	if (gdiplusToken)
		GdiplusShutdown(gdiplusToken);
}


void CPicture::FreePictureData()
{
	if (m_IPicture)
	{
		m_IPicture = nullptr;
		m_Height = 0;
		m_Weight = 0;
		m_Width = 0;
		m_nSize = 0;
	}
	m_hIcons = nullptr;
	m_lpIcons = nullptr;
	m_pBitmap = nullptr;
	m_pBitmapBuffer = nullptr;
}

// Util function to ease loading of FreeImage library
static FARPROC s_GetProcAddressEx(HMODULE hDll, const char* procName, bool& valid)
{
	FARPROC proc = nullptr;

	if (valid)
	{
		proc = GetProcAddress(hDll, procName);

		if (!proc)
			valid = false;
	}

	return proc;
}

std::wstring CPicture::GetFileSizeAsText(bool bAbbrev /* = true */)
{
	wchar_t buf[100] = { 0 };
	if (bAbbrev)
		StrFormatByteSize(m_nSize, buf, _countof(buf));
	else
		swprintf_s(buf, L"%lu Bytes", m_nSize);

	return std::wstring(buf);
}

bool CPicture::TryLoadIcon(const std::wstring& sFilePathName)
{
	// Icon file, get special treatment...
	CAutoFile hFile = CreateFile(sFilePathName.c_str(), GENERIC_READ, FILE_SHARE_READ, nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr);
	if (!hFile)
		return false;

	BY_HANDLE_FILE_INFORMATION fileinfo;
	if (!GetFileInformationByHandle(hFile, &fileinfo))
		return false;

	auto lpIcons = std::make_unique<BYTE[]>(fileinfo.nFileSizeLow);
	DWORD readbytes;
	if (!ReadFile(hFile, lpIcons.get(), fileinfo.nFileSizeLow, &readbytes, nullptr))
		return false;

	// we have the icon. Now gather the information we need later
	if (readbytes < sizeof(ICONDIR))
		return false;

	// we are going to open same file second time so we have to close the file now
	hFile.CloseHandle();

	auto lpIconDir = reinterpret_cast<LPICONDIR>(lpIcons.get());
	if (!((lpIconDir->idCount) && ((lpIconDir->idCount * sizeof(ICONDIR)) <= fileinfo.nFileSizeLow)))
		return false;

	try
	{
		nCurrentIcon = 0;
		std::vector<CAutoIcon> hIcons;
		// check that the pointers point to data that we just loaded
		if ((reinterpret_cast<BYTE*>(lpIconDir->idEntries) > reinterpret_cast<BYTE*>(lpIconDir)) &&
			(reinterpret_cast<BYTE*>(lpIconDir->idEntries) + (lpIconDir->idCount * sizeof(ICONDIRENTRY)) < reinterpret_cast<BYTE*>(lpIconDir) + fileinfo.nFileSizeLow))
		{
			m_Width = lpIconDir->idEntries[0].bWidth == 0 ? 256 : lpIconDir->idEntries[0].bWidth;
			m_Height = lpIconDir->idEntries[0].bHeight == 0 ? 256 : lpIconDir->idEntries[0].bHeight;
			for (int i = 0; i < lpIconDir->idCount; ++i)
			{
				CAutoIcon hIcon = static_cast<HICON>(LoadImage(nullptr, sFilePathName.c_str(), IMAGE_ICON,
															   lpIconDir->idEntries[i].bWidth == 0 ? 256 : lpIconDir->idEntries[i].bWidth,
															   lpIconDir->idEntries[i].bHeight == 0 ? 256 : lpIconDir->idEntries[i].bHeight,
															   LR_LOADFROMFILE));
				if (!hIcon)
				{
					// if the icon couldn't be loaded, the data is most likely corrupt
					throw std::runtime_error("could not load icon");
				}
				hIcons.emplace_back(std::move(hIcon));
			}
		}

		m_lpIcons = std::move(lpIcons);
		m_hIcons = std::make_unique<std::vector<CAutoIcon>>(std::move(hIcons));
	}
	catch (...)
	{
		return false;
	}

	return true;
}

bool CPicture::TryLoadWIC(const std::wstring& sFilePathName)
{
	CComPtr<IWICImagingFactory> pFactory;
	HRESULT hr = CoCreateInstance(CLSID_WICImagingFactory,
								  nullptr,
								  CLSCTX_INPROC_SERVER,
								  IID_IWICImagingFactory, reinterpret_cast<LPVOID*>(&pFactory));

	// Create a decoder from the file.
	if (FAILED(hr))
		return false;

	CComPtr<IWICBitmapDecoder> pDecoder;
	hr = pFactory->CreateDecoderFromFilename(sFilePathName.c_str(),
											 nullptr,
											 GENERIC_READ,
											 WICDecodeMetadataCacheOnDemand,
											 &pDecoder);
	if (FAILED(hr))
		return false;

	CComPtr<IWICBitmapFrameDecode> pBitmapFrameDecode;
	if (FAILED(pDecoder->GetFrame(0, &pBitmapFrameDecode)))
		return false;

	CComPtr<IWICFormatConverter> piFormatConverter = nullptr;
	if (FAILED(pFactory->CreateFormatConverter(&piFormatConverter)))
		return false;

	if (FAILED(piFormatConverter->Initialize(pBitmapFrameDecode, GUID_WICPixelFormat24bppBGR, WICBitmapDitherTypeNone, nullptr, 0.0, WICBitmapPaletteTypeCustom)))
		return false;

	UINT uWidth = 0;
	UINT uHeight = 0;
	if (FAILED(piFormatConverter->GetSize(&uWidth, &uHeight)))
		return false;

	WICPixelFormatGUID pixelFormat = { 0 };
	if (FAILED(piFormatConverter->GetPixelFormat(&pixelFormat)))
		return false;

	UINT cbStride = uWidth * 3;
	// Force the stride to be a multiple of sizeof(DWORD)
	cbStride = ((cbStride + sizeof(DWORD) - 1) / sizeof(DWORD)) * sizeof(DWORD);

	UINT cbBufferSize = cbStride * uHeight;
	// note: the buffer must exist during the lifetime of the pBitmap object created below
	auto pBitmapBuffer = std::make_unique<BYTE[]>(cbBufferSize);

	if (!pBitmapBuffer)
		return false;

	WICRect rc = { 0, 0, static_cast<int>(uWidth), static_cast<int>(uHeight) };
	if (FAILED(piFormatConverter->CopyPixels(&rc, cbStride, cbStride * uHeight, pBitmapBuffer.get())))
		return false;

	m_pBitmapBuffer = std::move(pBitmapBuffer);
	m_pBitmap = std::make_unique<Bitmap>(uWidth, uHeight, cbStride, PixelFormat24bppRGB, m_pBitmapBuffer.get());
	m_Height = uHeight;
	m_Width = uWidth;
	return true;
}

bool CPicture::TryLoadFreeImage(const std::wstring& sFilePathName)
{
	// Attempt to load the FreeImage library as an optional DLL to support additional formats

	// NOTE: Currently just loading via FreeImage & using GDI+ for drawing.
	// It might be nice to remove this dependency in the future.
	CAutoLibrary hFreeImageLib = LoadLibrary(L"FreeImage.dll");

	// FreeImage DLL functions
	using FreeImage_GetVersion_t = const char*(__stdcall*)(void);
	using FreeImage_GetFileType_t = int(__stdcall*)(const wchar_t* filename, int size);
	using FreeImage_GetFIFFromFilename_t = int(__stdcall*)(const wchar_t* filename);
	using FreeImage_Load_t = void*(__stdcall*)(int format, const wchar_t* filename, int flags);
	using FreeImage_Unload_t = void(__stdcall*)(void* dib);
	using FreeImage_GetColorType_t = int(__stdcall*)(void* dib);
	using FreeImage_GetWidth_t = unsigned(__stdcall*)(void* dib);
	using FreeImage_GetHeight_t = unsigned(__stdcall*)(void* dib);
	using FreeImage_ConvertToRawBits_t = void(__stdcall*)(BYTE* bits, void* dib, int pitch, unsigned bpp, unsigned red_mask, unsigned green_mask, unsigned blue_mask, BOOL topdown);

	//FreeImage_GetVersion_t FreeImage_GetVersion = nullptr;
	FreeImage_GetFileType_t FreeImage_GetFileType = nullptr;
	FreeImage_GetFIFFromFilename_t FreeImage_GetFIFFromFilename = nullptr;
	FreeImage_Load_t FreeImage_Load = nullptr;
	FreeImage_Unload_t FreeImage_Unload = nullptr;
	//FreeImage_GetColorType_t FreeImage_GetColorType = nullptr;
	FreeImage_GetWidth_t FreeImage_GetWidth = nullptr;
	FreeImage_GetHeight_t FreeImage_GetHeight = nullptr;
	FreeImage_ConvertToRawBits_t FreeImage_ConvertToRawBits = nullptr;

	if (!hFreeImageLib)
		return false;

	bool exportsValid = true;

	//FreeImage_GetVersion = reinterpret_cast<FreeImage_GetVersion_t>(s_GetProcAddressEx(hFreeImageLib, "_FreeImage_GetVersion@0", valid));
	FreeImage_GetWidth = reinterpret_cast<FreeImage_GetWidth_t>(s_GetProcAddressEx(hFreeImageLib, "_FreeImage_GetWidth@4", exportsValid));
	FreeImage_GetHeight = reinterpret_cast<FreeImage_GetHeight_t>(s_GetProcAddressEx(hFreeImageLib, "_FreeImage_GetHeight@4", exportsValid));
	FreeImage_Unload = reinterpret_cast<FreeImage_Unload_t>(s_GetProcAddressEx(hFreeImageLib, "_FreeImage_Unload@4", exportsValid));
	FreeImage_ConvertToRawBits = reinterpret_cast<FreeImage_ConvertToRawBits_t>(s_GetProcAddressEx(hFreeImageLib, "_FreeImage_ConvertToRawBits@32", exportsValid));

#ifdef UNICODE
	FreeImage_GetFileType = reinterpret_cast<FreeImage_GetFileType_t>(s_GetProcAddressEx(hFreeImageLib, "_FreeImage_GetFileTypeU@8", exportsValid));
	FreeImage_GetFIFFromFilename = reinterpret_cast<FreeImage_GetFIFFromFilename_t>(s_GetProcAddressEx(hFreeImageLib, "_FreeImage_GetFIFFromFilenameU@4", exportsValid));
	FreeImage_Load = reinterpret_cast<FreeImage_Load_t>(s_GetProcAddressEx(hFreeImageLib, "_FreeImage_LoadU@12", exportsValid));
#else
	FreeImage_GetFileType = reinterpret_cast<FreeImage_GetFileType_t>(s_GetProcAddressEx(hFreeImageLib, "_FreeImage_GetFileType@8", exportsValid));
	FreeImage_GetFIFFromFilename = reinterpret_cast<FreeImage_GetFIFFromFilename_t>(s_GetProcAddressEx(hFreeImageLib, "_FreeImage_GetFIFFromFilename@4", exportsValid));
	FreeImage_Load = reinterpret_cast<FreeImage_Load_t>(s_GetProcAddressEx(hFreeImageLib, "_FreeImage_Load@12", exportsValid));
#endif

	//const char* version = FreeImage_GetVersion();

	// Check the DLL is using compatible exports
	if (!exportsValid)
		return false;

	// Derive file type from file header.
	int fileType = FreeImage_GetFileType(sFilePathName.c_str(), 0);
	if (fileType < 0)
	{
		// No file header available, attempt to parse file name for extension.
		fileType = FreeImage_GetFIFFromFilename(sFilePathName.c_str());
	}

	// If we have a valid file type
	if (fileType < 0)
		return false;

	void* dib = FreeImage_Load(fileType, sFilePathName.c_str(), 0);
	if (!dib)
		return false;
	SCOPE_EXIT { FreeImage_Unload(dib); };

	unsigned width = FreeImage_GetWidth(dib);
	unsigned height = FreeImage_GetHeight(dib);

	// Create a GDI+ bitmap to load into...
	auto pBitmap = std::make_unique<Bitmap>(width, height, PixelFormat32bppARGB);

	if (!pBitmap || pBitmap->GetLastStatus() != Ok)
		return false;

	// Write & convert the loaded data into the GDI+ Bitmap
	Rect rect(0, 0, width, height);
	BitmapData bitmapData;
	if (pBitmap->LockBits(&rect, ImageLockModeWrite, PixelFormat32bppARGB, &bitmapData) != Ok)
		return false;

	FreeImage_ConvertToRawBits(static_cast<BYTE*>(bitmapData.Scan0), dib, bitmapData.Stride, 32, 0xff << RED_SHIFT, 0xff << GREEN_SHIFT, 0xff << BLUE_SHIFT, FALSE);

	pBitmap->UnlockBits(&bitmapData);

	m_Width = width;
	m_Height = height;
	m_pBitmap = std::move(pBitmap);
	
	return true;
}

bool CPicture::TryLoadSvg(const std::wstring& sFilePathName)
{
	// initialize Direct2D
	D2D1_FACTORY_OPTIONS options = {
#ifdef _DEBUG
		D2D1_DEBUG_LEVEL_INFORMATION
#endif
	};

	// open a stream from the .SVG file
	CComPtr<IStream> svgStream;
	if (FAILED(SHCreateStreamOnFileW(sFilePathName.c_str(), 0, &svgStream)))
		return false;

	CComPtr<ID2D1Factory> factory;
	if (FAILED(D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED, IID_ID2D1Factory, &options, reinterpret_cast<void**>(&factory))))
		return false;

	// create a DC render target
	CComPtr<ID2D1DCRenderTarget> target;
	D2D1_RENDER_TARGET_PROPERTIES props{};
	props.pixelFormat.format = DXGI_FORMAT_B8G8R8A8_UNORM;
	props.pixelFormat.alphaMode = D2D1_ALPHA_MODE_PREMULTIPLIED;
	if (FAILED(factory->CreateDCRenderTarget(&props, &target)))
		return false;

	// this requires Windows 10 1703
	CComPtr<ID2D1DeviceContext5> dc;
	if (FAILED(target->QueryInterface(&dc)))
		return false;

	// open the SVG as a document
	CComPtr<ID2D1SvgDocument> svg;
	D2D1_SIZE_F size = { static_cast<float>(1), static_cast<float>(1) };
	if (FAILED(dc->CreateSvgDocument(svgStream, size, &svg)))
		return false;

	CComPtr<ID2D1SvgElement> pSvgElement;
	D2D1_SVG_VIEWBOX viewBox{};
	float svgWidth = 0.0f;
	float svgHeight = 0.0f;

	svg->GetRoot(&pSvgElement);
	pSvgElement->GetAttributeValue(L"viewBox", D2D1_SVG_ATTRIBUTE_POD_TYPE_VIEWBOX, static_cast<void*>(&viewBox), sizeof(viewBox));
	pSvgElement->GetAttributeValue(L"width", &svgWidth);
	pSvgElement->GetAttributeValue(L"height", &svgHeight);

	long width = 1000;
	long height = 1000;
	if (viewBox.width != 0.0f && viewBox.height != 0.0f)
	{
		width = static_cast<long>(viewBox.width);
		height = static_cast<long>(viewBox.height);
	}
	if (height != 0 && width != 0)
	{
		width = static_cast<long>(svgWidth);
		height = static_cast<long>(svgHeight);
	}

	auto pBitmap = std::make_unique<Bitmap>(width, height, PixelFormat32bppARGB);
	Graphics g(pBitmap.get());
	RECT rc = { 0, 0, width, height };
	auto hdc = g.GetHDC();
	if (FAILED(target->BindDC(hdc, &rc)))
		return false;

	size = { static_cast<float>(width), static_cast<float>(height) };
	svg->SetViewportSize(size);

	// draw it on the render target
	target->BeginDraw();
	dc->DrawSvgDocument(svg);
	target->EndDraw();
	g.ReleaseHDC(hdc);

	m_Width = width;
	m_Height = height;
	m_pBitmap = std::move(pBitmap);

	return true;
}

bool CPicture::Load(std::wstring sFilePathName)
{
	bool bResult = false;
	bIsIcon = false;
	//CFile PictureFile;
	//CFileException e;
	FreePictureData(); // Important - Avoid Leaks...

	// No-op if no file specified
	if (sFilePathName.empty())
		return true;

	// Load & initialize the GDI+ library
	GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, nullptr);

	// Attempt to load using GDI+
	auto pBitmap = std::make_unique<Bitmap>(sFilePathName.c_str(), FALSE);
	GUID guid;
	pBitmap->GetRawFormat(&guid);

	if (pBitmap->GetLastStatus() != Ok)
		pBitmap = nullptr;

	// gdiplus only loads the first icon found in an icon file
	// so we have to handle icon files ourselves :(

	// Even though gdiplus can load icons, it can't load the new
	// icons from Vista - in Vista, the icon format changed slightly.
	// But the LoadIcon/LoadImage API still can load those icons,
	// at least those dimensions which are also used on pre-Vista
	// systems.
	// For that reason, we don't rely on gdiplus telling us if
	// the image format is "icon" or not, we also check the
	// file extension for ".ico".
	auto lowerfilename = sFilePathName;
	std::transform(lowerfilename.begin(), lowerfilename.end(), lowerfilename.begin(), ::towlower);
	bIsIcon = (guid == ImageFormatIcon) || (wcsstr(lowerfilename.c_str(), L".ico")) || (wcsstr(lowerfilename.c_str(), L".cur"));
	bIsTiff = (guid == ImageFormatTIFF) || (wcsstr(lowerfilename.c_str(), L".tiff"));
	m_Name = sFilePathName;

	if (bIsIcon)
		bResult = TryLoadIcon(sFilePathName);
	else if (wcsstr(lowerfilename.c_str(), L".svg"))
		bResult = TryLoadSvg(sFilePathName);
	else if (pBitmap) // Image loaded successfully with GDI+
	{
		m_Height = pBitmap->GetHeight();
		m_Width = pBitmap->GetWidth();
		m_pBitmap = std::move(pBitmap);
		bResult = true;
	}

	// If still failed to load the file...
	if (!bResult)
		bResult = TryLoadWIC(sFilePathName);

	if (!bResult)
		bResult = TryLoadFreeImage(sFilePathName);

	if (bResult)
	{
		CAutoFile hFile = CreateFile(sFilePathName.c_str(), GENERIC_READ, FILE_SHARE_READ, nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_HIDDEN, nullptr);
		if (hFile)
		{
			BY_HANDLE_FILE_INFORMATION fileinfo;
			if (GetFileInformationByHandle(hFile, &fileinfo))
			{
				m_nSize = fileinfo.nFileSizeLow;
			}
		}
	}

	m_ColorDepth = GetColorDepth();

	return(bResult);
}

bool CPicture::LoadPictureData(BYTE *pBuffer, int nSize)
{
	bool bResult = false;

	HGLOBAL hGlobalMem = GlobalAlloc(GMEM_MOVEABLE, nSize);

	if (!hGlobalMem)
	{
		return(false);
	}

	void* pData = GlobalLock(hGlobalMem);
	if (!pData)
	{
		GlobalFree(hGlobalMem);
		return false;
	}
	memcpy(pData, pBuffer, nSize);
	GlobalUnlock(hGlobalMem);

	CComPtr<IStream> pStream;

	if ((CreateStreamOnHGlobal(hGlobalMem, true, &pStream) == S_OK) && (pStream))
	{
		HRESULT hr = OleLoadPicture(pStream, nSize, false, IID_IPicture, reinterpret_cast<LPVOID*>(&m_IPicture));
		pStream = nullptr;

		bResult = hr == S_OK;
	}

	FreeResource(hGlobalMem); // 16Bit Windows Needs This (32Bit - Automatic Release)

	return(bResult);
}

bool CPicture::Show(HDC hDC, RECT DrawRect)
{
	if (!hDC)
		return false;
	if (bIsIcon && m_lpIcons)
	{
		::DrawIconEx(hDC, DrawRect.left, DrawRect.top, m_hIcons.get()->at(nCurrentIcon), DrawRect.right - DrawRect.left, DrawRect.bottom - DrawRect.top, 0, nullptr, DI_NORMAL);
		return true;
	}
	if (!m_IPicture && !m_pBitmap)
		return false;

	if (m_IPicture)
	{
		long Width = 0;
		long Height = 0;
		m_IPicture->get_Width(&Width);
		m_IPicture->get_Height(&Height);

		HRESULT hr = m_IPicture->Render(hDC,
										DrawRect.left,                  // Left
										DrawRect.top,                   // Top
										DrawRect.right - DrawRect.left, // Right
										DrawRect.bottom - DrawRect.top, // Bottom
										0,
										Height,
										Width,
										-Height,
										&DrawRect);

		if (SUCCEEDED(hr))
			return(true);
	}
	else if (m_pBitmap)
	{
		Graphics graphics(hDC);
		graphics.SetInterpolationMode(m_ip);
		graphics.SetPixelOffsetMode(PixelOffsetModeHighQuality);
		graphics.SetPixelOffsetMode(PixelOffsetModeHalf);
		ImageAttributes attr;
		attr.SetWrapMode(WrapModeTileFlipXY);
		Rect rect(DrawRect.left, DrawRect.top, DrawRect.right - DrawRect.left, DrawRect.bottom - DrawRect.top);
		graphics.DrawImage(m_pBitmap.get(), rect, 0, 0, m_Width, m_Height, UnitPixel, &attr);
		return true;
	}

	return(false);
}

bool CPicture::UpdateSizeOnDC(HDC hDC)
{
	if (!hDC || !m_IPicture) { m_Height = 0; m_Width = 0; return(false); };

	m_IPicture->get_Height(&m_Height);
	m_IPicture->get_Width(&m_Width);

	// Get Current DPI - Dot Per Inch
	int CurrentDPI_X = GetDeviceCaps(hDC, LOGPIXELSX);
	int CurrentDPI_Y = GetDeviceCaps(hDC, LOGPIXELSY);

	m_Height = MulDiv(m_Height, CurrentDPI_Y, HIMETRIC_INCH);
	m_Width = MulDiv(m_Width, CurrentDPI_X, HIMETRIC_INCH);

	return(true);
}

UINT CPicture::GetColorDepth() const
{
	if (bIsIcon && m_lpIcons)
	{
		auto lpIconDir = reinterpret_cast<LPICONDIR>(m_lpIcons.get());
		return lpIconDir->idEntries[nCurrentIcon].wBitCount;
	}

	// try first with WIC to get the pixel format since GDI+ often returns 32-bit even if it's not
	// Create the image factory.
	UINT bpp = 0;
	CComPtr<IWICImagingFactory> pFactory;
	HRESULT hr = CoCreateInstance(CLSID_WICImagingFactory,
								  nullptr,
								  CLSCTX_INPROC_SERVER,
								  IID_IWICImagingFactory,
								  reinterpret_cast<LPVOID*>(&pFactory));

	// Create a decoder from the file.
	if (SUCCEEDED(hr))
	{
		CComPtr<IWICBitmapDecoder> pDecoder;
		hr = pFactory->CreateDecoderFromFilename(m_Name.c_str(),
												 nullptr,
												 GENERIC_READ,
												 WICDecodeMetadataCacheOnDemand,
												 &pDecoder);
		if (SUCCEEDED(hr))
		{
			CComPtr<IWICBitmapFrameDecode> pBitmapFrameDecode;
			hr = pDecoder->GetFrame(0, &pBitmapFrameDecode);
			if (SUCCEEDED(hr))
			{
				WICPixelFormatGUID pixelFormat;
				hr = pBitmapFrameDecode->GetPixelFormat(&pixelFormat);
				if (SUCCEEDED(hr))
				{
					CComPtr<IWICComponentInfo> piCompInfo;
					hr = pFactory->CreateComponentInfo(pixelFormat, &piCompInfo);
					if (SUCCEEDED(hr))
					{
						CComPtr<IWICPixelFormatInfo> piPixelFormatInfo;
						hr = piCompInfo->QueryInterface(IID_IWICPixelFormatInfo, reinterpret_cast<LPVOID*>(&piPixelFormatInfo));
						if (SUCCEEDED(hr))
						{
							hr = piPixelFormatInfo->GetBitsPerPixel(&bpp);
						}
					}
				}
			}
		}
	}
	if (bpp)
		return bpp;

	switch (GetPixelFormat())
	{
		case PixelFormat1bppIndexed:
			return 1;
		case PixelFormat4bppIndexed:
			return 4;
		case PixelFormat8bppIndexed:
			return 8;
		case PixelFormat16bppARGB1555:
		case PixelFormat16bppGrayScale:
		case PixelFormat16bppRGB555:
		case PixelFormat16bppRGB565:
			return 16;
		case PixelFormat24bppRGB:
			return 24;
		case PixelFormat32bppARGB:
		case PixelFormat32bppPARGB:
		case PixelFormat32bppRGB:
			return 32;
		case PixelFormat48bppRGB:
			// note: GDI+ converts images with bit depths > 32 automatically
			// on loading, so PixelFormat48bppRGB, PixelFormat64bppARGB and
			// PixelFormat64bppPARGB will never be used here.
			return 48;
		case PixelFormat64bppARGB:
		case PixelFormat64bppPARGB:
			return 64;
	}
	return 0;
}

UINT CPicture::GetNumberOfFrames(int dimension)
{
	if (bIsIcon && m_lpIcons)
	{
		return 1;
	}
	if (!m_pBitmap)
		return 0;
	UINT count = m_pBitmap->GetFrameDimensionsCount();
	auto pDimensionIDs = static_cast<GUID*>(malloc(sizeof(GUID) * count));

	m_pBitmap->GetFrameDimensionsList(pDimensionIDs, count);

	UINT frameCount = m_pBitmap->GetFrameCount(&pDimensionIDs[dimension]);

	free(pDimensionIDs);
	return frameCount;
}

UINT CPicture::GetNumberOfDimensions()
{
	if (bIsIcon && m_lpIcons)
	{
		auto lpIconDir = reinterpret_cast<LPICONDIR>(m_lpIcons.get());
		return lpIconDir->idCount;
	}
	return m_pBitmap ? m_pBitmap->GetFrameDimensionsCount() : 0;
}

long CPicture::SetActiveFrame(UINT frame)
{
	if (bIsIcon && m_lpIcons)
	{
		nCurrentIcon = frame - 1;
		m_Height = GetHeight();
		m_Width = GetWidth();
		return 0;
	}
	if (!m_pBitmap)
		return 0;
	UINT count = m_pBitmap->GetFrameDimensionsCount();
	auto pDimensionIDs = static_cast<GUID*>(malloc(sizeof(GUID) * count));

	m_pBitmap->GetFrameDimensionsList(pDimensionIDs, count);

	UINT frameCount = m_pBitmap->GetFrameCount(&pDimensionIDs[0]);

	free(pDimensionIDs);

	if (frame > frameCount)
		return 0;

	GUID pageGuid = FrameDimensionTime;
	if (bIsTiff)
		pageGuid = FrameDimensionPage;
	m_pBitmap->SelectActiveFrame(&pageGuid, frame);

	// Assume that the image has a property item of type PropertyItemEquipMake.
	// Get the size of that property item.
	int nSize = m_pBitmap->GetPropertyItemSize(PropertyTagFrameDelay);

	// Allocate a buffer to receive the property item.
	auto pPropertyItem = static_cast<PropertyItem*>(malloc(nSize));

	Status s = m_pBitmap->GetPropertyItem(PropertyTagFrameDelay, nSize, pPropertyItem);

	UINT prevframe = frame;
	if (prevframe > 0)
		prevframe--;
	long delay = 0;
	if (s == Ok)
	{
		delay = reinterpret_cast<long*>(pPropertyItem->value)[prevframe] * 10;
	}
	free(pPropertyItem);
	m_Height = GetHeight();
	m_Width = GetWidth();
	return delay;
}

UINT CPicture::GetHeight() const
{
	if ((bIsIcon) && (m_lpIcons))
	{
		auto lpIconDir = reinterpret_cast<LPICONDIR>(m_lpIcons.get());
		return lpIconDir->idEntries[nCurrentIcon].bHeight == 0 ? 256 : lpIconDir->idEntries[nCurrentIcon].bHeight;
	}
	return m_pBitmap ? m_pBitmap->GetHeight() : 0;
}

UINT CPicture::GetWidth() const
{
	if ((bIsIcon) && (m_lpIcons))
	{
		auto lpIconDir = reinterpret_cast<LPICONDIR>(m_lpIcons.get());
		return lpIconDir->idEntries[nCurrentIcon].bWidth == 0 ? 256 : lpIconDir->idEntries[nCurrentIcon].bWidth;
	}
	return m_pBitmap ? m_pBitmap->GetWidth() : 0;
}

PixelFormat CPicture::GetPixelFormat() const
{
	if ((bIsIcon) && (m_lpIcons))
	{
		auto lpIconDir = reinterpret_cast<LPICONDIR>(m_lpIcons.get());
		if (lpIconDir->idEntries[nCurrentIcon].wPlanes == 1)
		{
			if (lpIconDir->idEntries[nCurrentIcon].wBitCount == 1)
				return PixelFormat1bppIndexed;
			if (lpIconDir->idEntries[nCurrentIcon].wBitCount == 4)
				return PixelFormat4bppIndexed;
			if (lpIconDir->idEntries[nCurrentIcon].wBitCount == 8)
				return PixelFormat8bppIndexed;
		}
		if (lpIconDir->idEntries[nCurrentIcon].wBitCount == 32)
		{
			return PixelFormat32bppARGB;
		}
	}
	return m_pBitmap ? m_pBitmap->GetPixelFormat() : 0;
}
